Automatic brake



May 28, 1929. W E HALE 1,715,093

AUTOMATIC BRAKE Filed April' 24, 1926 lil Patented May 28, 1929.

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W'ILLAIVE E. HALE, OF FORT WASHINGTON, PENNSYLVANIA, ASSGNOR TO H. BEAU- MONT C`}OI'l'P\ \TY OF PHILADELPHIA, ENNSYLVANTA, A COBIPORATIQN OF PENN- SYLVANTA.

AUTOMATIC BRAKE.

Application ed April 24, 1926.

The principal object of the present invention is to automatically apply a band braking effect of relatively large magnitude to a drum revolved in one direction and to automatically apply a band braking effect of relatively small or perhaps even negligible magnitude when the drum is revolved in the other direction.

Other objects of the invention will appear from the following description at the end of which the invention will be claimed. y

Tn the following description reference will be made to the accompanying drawing formnu ing part hereof and in which Figures l and 2 are more or lessy diagrammatic elevational views of automatic brake mechanism embodying features of the invention and illustrating the position of the parts thereof when the drum is run or turned in opposite directions.

in the drawing l is a bralre drum surrounded'by brake band sections 2 and 3 each having one end fastened to a pivoted arm 4 and the other ends connected together by a bolt 5 on which is mounted a spring 6. The pivoted arm 4; is mounted upon a bearing member 7 and has its motion restrained in one direction by a stop 8. The brake band and the pivot ally supported arm are hinged together.

litlhen the brake drum l is turned in clochwise direction, as shown in Fig. 1, the brake band is carried around in the same direction the drum7 bending the hinge and coming into closer Contact with the drum, with the result that the pivoted member 4 is moved into such position that the angle a is reduced until the forces acting through t, 2 and 3 are in equilibrium with equal to the ratio fixed by the well known laws of friction.

Referring to Fig. 2, which shows the drum revolving in anti-clockwise direction,Y the hinge between the brake band and the arm 4 is straightened and its motion restrained by the stop S at a position wherethe brake band is in maximum slack position.

When the drum revolves in one direction the brake band is applied as a brake of a magnitude or amount fixed by the design and elasticity of the parts used and i if desired Serial No. 104,304.

adjustable in magnitude by'means of a variable elastic member G, and when the drum revolves in a reverse direction the braking effort is small7 being produced only through the weight of the brake bands or other parts resting upon the drum which weight can be reduced to a minimum, this minimum being that required to produce effort enough to move the mechanism from the operating position in one direction to the operating position in the other direction. ln other words, it is the friction due to the weight of the brake band when the drum is running that shifts the parts from the positions shown in Fig. 2 to the positions shown in Fig. l when the direction'of turning movement of the drum is reversed.

It will be obvious to those skilled in the art to which the invention relates that modifications may be made in details of construction and arrangement and in matters of mere form without departing' from the spirit of the invention which vis not limited to such mattersor otherwise than the` prior art and the appended claims may require.

l claim:

l. An automatic brake including a brake band and a pivotally supported bar hingedV together, a drum in the brake band and adapted by friction on the band when turned in one direction toben d said hinge and tighten Sev the band and when turned in the other direction to straighten saidrhingev andslaclen'the band said band constituting thesole connection between the drum and the bar,`and a stop for limiting the straightening movement of the hinge.

2. An' automatic brake comprising a sectional bralre band including an elastic member, a pivotally supported'barhinged to the ends of saidband, a drum in the brake Yband and adapted when turned in one direction to bend said hinge-and tighten the band and when turned in the other direction to straighten said hinge and slacken the band7 and avstop for limiting' the straightening movement of the hinge.

' WrLLrAM E. HALE. 

